Pal-GHK is a form of the extracellular matrix-derived peptide GHK containing palmitic acid , which allows it to penetrate the stratum corneum to the epidermal and dermal skin layers. Pal-GHK (0.5 µM) increases collagen synthesis in human skin fibroblasts in vitro. It reduces collagen degradation ex vivo in patient-derived human skin samples irradiated with UVA light when used at a concentration of 6 ppm. It has been used with the zwitterionic surfactant C dodecyldimethylamine oxide (CDMAO) to study self-assembly of the mixture into aggregates, ribbons, and nanobelts. Pal-GHK has also been used as an internal standard for the quantification of pal-KTTKS in anti-wrinkle creams by LC-MS/MS.